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A cesium photocell, with a steady potent...

A cesium photocell, with a steady potential difference of 60 V across it ,is illuminated by a small bright light placed 1m away. When the same light is placed 2m away, the electrons crossing the photocell

A

Each carry one quarter of their previous energy

B

Each carry one quarter of their previous momentum

C

Are half as numerous

D

Are one quarter as numerous

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